雲の十種雲形(Ten Basic Cloud Types)

上層雲(High Clouds)

巻雲(Ci)巻層雲(Cs)巻積雲(Cc)
CirrusCirrostratusCirrocumulus

中層雲(Mid Clouds)

高層雲(As)高積雲(Ac)乱層雲(Ns)
AltostratusAltocumulusNimbostratus

下層雲(Low Clouds)

層雲(St)層積雲(Sc)積雲(Cu)積乱雲(Cb)
StratusStratocumulusCumulusCumulonimbus
(http://www.srh.noaa.gov/srh/jetstream/clouds/cloudwise/types.html)